- Add audit subagent that runs automatically after bill entries
- Create download-attachment.sh for retrieving invoice/receipt PDFs
- Create verify-pdf.py for PDF extraction with OCR fallback
- Restructure SKILL.md from 856 to 177 lines using reference files
- Move detailed content to references/:
- schema.md: table schemas
- workflows.md: code examples
- queries.md: SQL queries and financial reports
- audit.md: audit queries and remediation steps